Buggy code:
class SessionOpenRequestHandler extends EJBIdentifierBasedMessageHandler { private static final Logger logger = Logger . getLogger ( SessionOpenRequestHandler . class ) ; private static final byte HEADER_SESSION_OPEN_RESPONSE = 2 ; private static final byte HEADER_EJB_NOT_STATEFUL = 13 ; private final ExecutorService executorService ; private final MarshallerFactory marshallerFactory ; SessionOpenRequestHandler ( final DeploymentRepository deploymentRepository , final MarshallerFactory marshallerFactory , final ExecutorService executorService ) { } @ Override public void processMessage ( ChannelAssociation channelAssociation , MessageInputStream messageInputStream ) throws IOException { if ( messageInputStream == null ) { <START_BUG> throw new IllegalArgumentException ( "Cannot<seq2seq4repair_space>read<seq2seq4repair_space>from<seq2seq4repair_space>null<seq2seq4repair_space>message<seq2seq4repair_space>inputstream" ) ; <END_BUG> } final DataInputStream dataInputStream = new DataInputStream ( messageInputStream ) ; final short invocationId = dataInputStream . readShort ( ) ; final String appName = dataInputStream . readUTF ( ) ; final String moduleName = dataInputStream . readUTF ( ) ; final String distinctName = dataInputStream . readUTF ( ) ; final String beanName = dataInputStream . readUTF ( ) ; final EjbDeploymentInformation ejbDeploymentInformation = this . findEJB ( appName , moduleName , distinctName , beanName ) ; if ( ejbDeploymentInformation == null ) { this . writeNoSuchEJBFailureMessage ( channelAssociation , invocationId , appName , moduleName , distinctName , beanName , null ) ; return ; } final Component component = ejbDeploymentInformation . getEjbComponent ( ) ; if ( ! ( component instanceof StatefulSessionComponent ) ) { final String failureMessage = ( ( ( ( ( ( "EJB<seq2seq4repair_space>" + beanName ) + "<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>a<seq2seq4repair_space>Stateful<seq2seq4repair_space>Session<seq2seq4repair_space>bean<seq2seq4repair_space>in<seq2seq4repair_space>app:<seq2seq4repair_space>" ) + appName ) + "<seq2seq4repair_space>module:<seq2seq4repair_space>" ) + moduleName ) + "<seq2seq4repair_space>distinct<seq2seq4repair_space>name:" ) + distinctName ; this . writeInvocationFailure ( channelAssociation , SessionOpenRequestHandler . HEADER_EJB_NOT_STATEFUL , invocationId , failureMessage ) ; return ; } final StatefulSessionComponent statefulSessionComponent = ( ( StatefulSessionComponent ) ( component ) ) ; executorService . submit ( new SessionOpenRequestHandler . SessionIDGeneratorTask ( statefulSessionComponent , channelAssociation , invocationId ) ) ; } private void writeSessionId ( final ChannelAssociation channelAssociation , final short invocationId , final SessionID sessionID , final Affinity hardAffinity ) throws IOException { } private class SessionIDGeneratorTask implements Runnable { private final StatefulSessionComponent statefulSessionComponent ; private final ChannelAssociation channelAssociation ; private final short invocationId ; SessionIDGeneratorTask ( final StatefulSessionComponent statefulSessionComponent , final ChannelAssociation channelAssociation , final short invocationId ) { } @ Override public void run ( ) { } } }

Fix:
throw MESSAGES . messageInputStreamCannotBeNull ( ) ;